Fastening device



Feb. 16, 1943. c. HAPANOWICZ 2,311,592

FASTENING DEVICE Filed March 21, 1941 INVENTOR:

fiis ATTORNEY.

3 3 of Fi 1;

I3 and a b01t'30.

Patented Feb. 16, 1943 FASTENING DEVICE Charles Hapanowicz, Newark, N. J assignor of fifty per cent to Herbert J. Newmark, New York,

Application March 21, 1941, Serial No. 384,472

4 Claims.

This invention relates to fastening devices. It is particularly directed to means for securing together plates, walls or sheets, such as cowls or wings of aeroplanes, and the like devices.

An object of this invention is to provide a fastem'n'g device of the character described, having means for adjusting the securing pressure, and to take up looseness or slack which may develop between the parts secured.

A further object of this invention is to provide a fastening device of the character described, which will have a lock bolt and nut effect, but eliminating necessity for screw threads.

Yet a further object of this .invention is to provide a compact and durable device of the character described, which shall be relatively inexpensive to manufacture, simple in construction, light in weight, and shall be easy to manipulate, and which shall yet be practical and efiicient to a high degree in use.

Other objects of this invention will in part be obvious and in part hereinafter pointed'out.

The invention accordingly consists in the features of construction, combinations of elements, and arrangement of parts which will be exemplifled in the construction hereinafter described, and of which the scope of application will be indicated in the following claims.

described hereinafter. Opening I2 is of a larger diameter than opening 34, for the purpose hereinafter explained.

The bolt 30 has at one end an enlarged head 3| formed with a kerf 36, so that the bolt may be turned by means of a. screw driver. The head 8! is conical and is received in the countersunk shank portions 3Ia, 32 is a collar 32a of a diameter equal to the diameter of opening 34, but less in-diameter than opening I2. Collar 32a can be In the accompanying drawing, in which is f shown various possible illustrative embodiments of this invention, 7

, Fig. l is a top plan view of a pair of superimposed plates secured together by a fastening device embodying the invention;

Fig. 2 is a cross-sectional view taken on line 22 of Fig. 1;

Fig. 3 is a cross-sectional view taken on line Fig. 4 is a bottom plan view'of the structure shown in Fig. 1; Y

Fig. 5 is a fragmentary perspective view of the locking spring forming part of the fastening device embodying the invention; and

Fig. 6 is a perspective view of the bolt forming part of the fastening device embodying the invention. g

Referring now in detail to the drawing, numerals I0 and II indicate two superimposed plates which are fastened together by fastening means F embodying the invention. The fastening means F comprises generally a spring device The plates Ill and II are formed with holes 34 and I2, respectively, 1 through which the bolt passes for engagement 25, and between the parts 26 and 28, is a shallownotch 21. The highest point of'theupper edge with the spring device I3, as will be more fully forced through opening 34, but once through said opening, will prevent bolt 30 from accidentally It will now be understood that when the central or arched portion of the spring is pressed downwardly, the terminal portions I5 will spread, the slots I5a permitting the spreading apartof said terminal portions.

At the center of the arched portion I4 is an upwardly pressed integral sleeve I8, co-axial with i the holes I2, 34, and adaptedto receive the portion 32 of the bolt 30. Sam sleeve I8 is formed with a longitudinal through a slot I9. In passing the bolt upwardly to engage the spring in a manner hereinafter appearing, the lug 33 passes through the slot I9, entering said slot through the lower end 20 thereof. The sleeve I8 has at its upper end a helical edge surface 2I beginning and ending at the slot IS. The helical surface 2 I' is divided into four gradually rising parts, designated by numerals 22,, 24, 26 and 28. Between the parts 22 and 24 is a shallow notch 23. Between the parts 2 4 and 26 is a shallow notch 2| of the sleeve is indicated by numeral 28 on the drawing.

To secure the plates together, the bolt 30 is 

